The folding “clamshell” mobile phone was chosen as the dominant industrial design in the Japanese mobile phone industry due to the importance of mail functionality, and NEC actively pushed this style and acquired major market share. As a result, at the start of the 21st century, the dominant design “Galapagos ke-tai,” unique to Japan, was established. However, this dominant industrial design along with the functionality of these phones became a barrier to the Japanese mobile phone industry when they shifted to smartphones. In other words, a dominant industrial design determined the competitive positions of companies.